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                [SCOI2007]kshort                </h1>
                <p>时间限制：20s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：162MB</p>			</div>
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                                <h3>题目描述</h3><p><p>　　有n个城市和m条单向道路，城市编号为1~n。每条道路连接两个不同的城市，且任意两条道路要么起点不同要<br />
么终点不同，因此n和m满足m&lt;=n(n-1)。给定两个城市a和b，可以给a到b的所有简单路（所有城市最多经过一次，<br />
包括起点和终点）排序：先按长度从小到大排序，长度相同时按照字典序从小到大排序。你的任务是求出a到b的第<br />
k短路。</p></p><hr/><h3>输入格式</h3><p><p>　　输入第一行包含五个正整数n, m, k, a, b。以下m行每行三个整数u, v, l，表示从城市u到城市v有一条长度<br />
为l的单向道路。100%的数据满足：2&lt;=n&lt;=50, 1&lt;=k&lt;=200</p></p><hr/><h3>输出格式</h3><p><p>　　如果a到b的简单路不足k条，输出No，否则输出第k短路：从城市a开始依次输出每个到达的城市，直到城市b，<br />
中间用减号&quot;-&quot;分割。</p></p><hr/><h3>样例输入</h3><pre>【样例输入1】
5 20 10 1 5
1 2 1
1 3 2
1 4 1
1 5 3
2 1 1
2 3 1
2 4 2
2 5 2
3 1 1
3 2 2
3 4 1
3 5 1
4 1 1
4 2 1
4 3 1
4 5 2
5 1 1
5 2 1
5 3 1
5 4 1
【样例输入2】
4 6 1 1 4
2 4 2
1 3 2
1 2 1
1 4 3
2 3 1
3 4 1
【样例输入3】
3 3 5 1 3
1 2 1
2 3 1
1 3 1</pre><hr/><h3>样例输出</h3><pre>【样例输出1】
1-2-4-3-5
【样例输出2】
1-2-3-4
【样例输出3】
No</pre><hr/><h3>提示</h3><p><p><span style="font-size: medium">第一个例子有5个城市，所有可能出现的道路均存在。从城市1到城市5一共有5条简单路</span></p>
<p><span style="font-size: medium"><img width="447" height="216" alt="" src="../file/1073_0.png" /><br />
</span></p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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